題目描述：

找出距離num最近的所有位都為偶數(shù)的數(shù)，首先分為三部分

第一部分：

所有數(shù)都是偶數(shù)，則返回0

第二部分：找big_num

如果存在奇數(shù)，則判斷該奇數(shù)是不是9

• 不是9，則big_num為該位add 1,后面剩余位為0
• 為9，判斷前一位是不是8，不是8，則前一位add 2,后面剩余位為0
• 為9，且前一位為8，則距離最近的那個(gè)數(shù)就是small_num,即該位即以后所有位都為8

第三部分：找small_num

如果存在奇數(shù)，則該位sub 1,后面剩余位都為8

# -*- coding: utf-8 -*- """ Created on Tue Jul 7 15:24:35 2020@author: natur """def check_bit_com_big(num):num = str(num)big_num_test=""big_num = ""for i in range(len(num)):num_bit = num[i:i+1]num_bit = int(num_bit)big_num_test +=str(num_bit)if num_bit in odd_list:big_num += big_num_test[0:i]num_bit = num_bit + 1big_num += str(num_bit)big_num += str(0)*(len(num)-i-1)breakreturn(big_num)def special_9_check_bit_com_big(num):num = str(num)big_num_test=""big_num = ""for i in range(len(num)):num_bit = num[i:i+1]num_bit = int(num_bit)big_num_test +=str(num_bit)if num_bit == 9:#mett_89if int(num[i-1:i]) == 8:big_num += big_num_test[0:i]num_bit = 8big_num += str(num_bit)big_num += str(8)*(len(num)-i-1)breakelse:pre_bit = int(num[i-1:i]) + 2big_num += big_num_test[0:i-1]big_num += str(pre_bit)big_num += str(0)*(len(num)-i)breakelif num_bit in odd_list:big_num += big_num_test[0:i]num_bit = num_bit + 1big_num += str(num_bit)big_num += str(0)*(len(num)-i-1)breakelse:return "0"return(big_num)def check_bit_com_small(num):num = str(num)small_num_test=""small_num = ""for i in range(len(num)):num_bit = num[i:i+1]num_bit = int(num_bit)small_num_test +=str(num_bit)if num_bit in odd_list:small_num += small_num_test[0:i]num_bit = num_bit - 1small_num += str(num_bit)small_num += str(8)*(len(num)-i-1)breakelse:return "0"return(small_num)def begin_num(num):big_num = int(special_9_check_bit_com_big(num))small_num = int(check_bit_com_small(num))big_button = big_num-numsmall_button = num-small_numif big_num == 0:true_button = 0elif big_button<0:true_button = small_buttonelse:true_button = min(big_button,small_button)return true_buttonif __name__ == "__main__":even_list = [0,2,4,6,8]odd_list = [1,3,5,7,9]round = int(input())for i in range(round):num = int(input())true_button = begin_num(num)print("Case #"+str(i+1)+":"+" "+str(true_button))

test

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